Vienna: A vaginal gel that women can use significantly reduces a woman's risk of being infected with the HIV/Aids virus to a rate similar to how circumcision works with men, scientists said from a study done in South Africa.

Kigali: Scientists in the US have succeeded in genetically engineering a malaria-resistant mosquito. The researchers, from the University of Arizona, introduced a gene that affected the insect's gut, meaning the malaria parasite could not develop.